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Re: [dm-devel] [PATCH 0/3][RESEND]multipath-tools: mpathpersist utility for managing persistent reservation on dm multipath device.



On Wednesday, January 25, 2012 9:12 PM, Fil Wrote:
>Here is the info you requested.

Fil, Thanks for the logs.

>On 01/25/2012 02:45 AM, Chauhan, Vijay wrote:
>> On January 24, 2012, Fil Wrote:
>>>
>>> 1. Patches apply against the 63704387009443bdb37d9deaaafa9ab121d45bfb
>>> without any problems. Everything builds correctly (tested it on
>centos
>>> 6.2 and fedora 16).
>>>
>>> 2. multipathd runs correctly.
>>>
>>
>> Fil, Thanks for the update. Good to know.
>>
>>> 3. mpathpersist is missing --no-inquiry option. It would be nice to
>be
>>> compatible with  sg_persist. (breaks most of my test scripts.)
>>>
>>> 4. mpathpersist -d /dev/mapper/blah --in --read-status
>>> mpathpersist: unrecognized option '--read-status'
>>> unrecognised switch code 0x3f ??
>>>
>>
>> There is a typo in usage output. Please use --read-full-status
>instead. I will correct it.
>
>still no go...
>

It seems issue 4 is resolved with option '--read-full-status'

>mpathpersist -d /dev/mapper/blah --in --read-full-status
>Persistent Reserve IN command failed
>mpathpersist -d /dev/mapper/blah --in --read-full-status -v3

>Jan 25 10:32:37 | alias = blah
>Jan 25 10:32:37 | 36001405c55fc03cd8193d491eda0d4d7: sending pr in
>command to sda
>Jan 25 10:32:37 | sda: duration = 2 (ms)
>Jan 25 10:32:37 | sda: status driver:00 host:04 scsi:00

PRIN command returned with DID_BAD_TARGET host status. iscsi layer returns this when we get some bad output from 
target. This does not look like issue related to this feature. 

>>
>>> 5. registration works
>>>
>>> 6. reservation, reserves only a single path. (is this by design?)
>>
>> Yes, this is as per design. Reservation is sent to one of the active
>> path and reservation is applicable to registered I_T nexus with
>respect to pr type.
>>
>> I was expecting your device server to  apply reservation to all the
>> registered I_T nexus for pr type "Exclusive Access, all registrants".
>Can you verify the below output again?
>>
>> Please see below in SPC4
>> "For a persistent reservation of the type Write Exclusive – All
>Registrants or Exclusive Access – All Registrants,
>> the persistent reservation holder is any registered I_T nexus;"
>>
>>> mpathpersist --out --reserve --param-rk=123abc --prout-type=8 -d
>>> /dev/mapper/blah
>>>
>>> sg_persist -i -s /dev/mapper/blah
>>>  QNAP      iSCSI Storage     3.1
>>>  Peripheral device type: disk
>>>  PR generation=0x8
>>>    Key=0x123abc
>>>      All target ports bit clear
>>>      Relative port address: 0x1
>>>      not reservation holder
>>>      Transport Id of initiator:
>>>        iSCSI name and session id: iqn.2009-
>>> 11.com.adriaticsolutions:blah
>>>    Key=0x123abc
>>>      All target ports bit clear
>>>      Relative port address: 0x1
>>>      << Reservation holder >>
>>>      scope: LU_SCOPE,  type: Exclusive Access, all registrants
>>>      Transport Id of initiator:
>>>        iSCSI name and session id: iqn.2009-
>>> 11.com.adriaticsolutions:blah
>>>
>>> multipath -ll
>>> blah (36001405c55fc03cd8193d491eda0d4d7) dm-4 QNAP,iSCSI Storage
>>> size=10G features='0' hwhandler='0' wp=rw
>>> `-+- policy='round-robin 0' prio=1 status=active
>>>  |- 16:0:0:0 sda 8:0  active ready  running
>>>  `- 17:0:0:0 sdb 8:16 failed faulty running
>>>
>>> 7. mpathpersist -d /dev/mapper/blah --in --read-reservation
>>> Persistent Reserve IN command failed
>>>
>> Can you please share the output with verbose 3. Append '-v3'.
>
>
>mpathpersist -d /dev/mapper/blah --in --read-reservation
>Persistent Reserve IN command failed
>mpathpersist -d /dev/mapper/blah --in --read-reservation -v3
>Jan 25 10:34:07 | alias = blah

>Jan 25 10:34:07 | 36001405c55fc03cd8193d491eda0d4d7: sending pr in
>command to sda
>Jan 25 10:34:07 | sda: duration = 1 (ms)
>Jan 25 10:34:07 | sda: status driver:00 host:04 scsi:00

Same is with issue 7. PRIN command returned with DID_BAD_TARGET host status.

>Jan 25 10:34:07 | directio checker refcount 2
>Jan 25 10:34:07 | directio checker refcount 1
>Persistent Reserve IN command failed
>Jan 25 10:34:07 | unloading const prioritizer
>Jan 25 10:34:07 | unloading directio checker
>
>>
>>> 8. release 'fails' because reservation registered only a single path
>and
>>> the other one is in a failed state.
>>>
>>> mpathpersist -d /dev/mapper/blah --out --release --param-rk=123abc
>>> --prout-type=8
>>> Jan 24 00:43:53 | 36001405c55fc03cd8193d491eda0d4d7: pr in read
>>> reservation command failed.
>>> PR out: command failed
>>>
>> As per design, release service action performs following steps:
>> Step 1) PROUT 'release' SA is sent on the all paths of the multipath
>device as it is not clear which data path is reservation holder.
>> STEP 2) PRIN read reservation SA is sent to one of the active path to
>verify the reservation.
>> STEP 3) If the Read Reservation parameter data indicates that the
>logical unit is still reserved then this indicates that the reservation
>holder belongs to a data path in failed state or removed data path of
>the multipath device, continue else goto step 7
>> STEP 4) PRIN Report Full Status  service action is issued to any
>active data path. Full status descriptors are saved.
>> STEP 5) PROUT clear reservation service action is sent via any active
>data path to clear the reservation and
>> Registrants
>> STEP 6) all registrants are restored by issuing PROUT register service
>action with transport IDs from the full status
>> descriptors saved in the step 4
>> STEP 7) exit with status
>>
>> It looks like you are getting into some other issue. Can you please
>share the output with verbose with '-v3'.
>
>
>mpathpersist -d /dev/mapper/blah --out --release --param-rk=123abc
>--prout-type=8 -v3
>Jan 25 10:35:41 | alias = blah

>Jan 25 10:35:41 | 36001405c55fc03cd8193d491eda0d4d7: sending pr out
>command to sda
>Jan 25 10:35:41 | 36001405c55fc03cd8193d491eda0d4d7: sdb path not up.
>Jan 25 10:35:41 | sda: rq_servact = 2
>Jan 25 10:35:41 | sda: rq_scope = 0
>Jan 25 10:35:41 | sda: rq_type = 8
>Jan 25 10:35:41 | sda: paramlen = 24
>Jan 25 10:35:41 | sda: Persistent Reservation OUT parameter:
>Jan 25 10:35:41 |         00 00 00 00 00 12 3a bc  00 00 00 00 00 00 00
>00
>Jan 25 10:35:41 |         00 00 00 00 00 00 00 00
>Jan 25 10:35:41 | sda: Duration=1 (ms)
>Jan 25 10:35:41 | sda: status driver:00 host:00 scsi:00
>Jan 25 10:35:41 | sda: status = 0
>Jan 25 10:35:41 | 36001405c55fc03cd8193d491eda0d4d7: sending pr in
>command to sda
>Jan 25 10:35:41 | sda: duration = 1 (ms)
>Jan 25 10:35:41 | sda: status driver:08 host:00 scsi:02
>Jan 25 10:35:41 | sda: Sense_Key=06, ASC=00 ASCQ=00
>Jan 25 10:35:41 | sda: retrying for Unit Attention. Remaining retries =
>4
>Jan 25 10:35:41 | sda: duration = 0 (ms)
>Jan 25 10:35:41 | sda: status driver:00 host:04 scsi:00

Same with issue 8. PRIN command returned with DID_BAD_TARGET host status.

All the three failures reported above are due to DID_BAD_TARGET host status returned for 
the PRIN command. It does not look like anywhere this feature is related to the above reported errors.

>>> 9. de-registration works....
>>>

Thanks,
Vijay


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